1/*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8#ifndef SkValidatingReadBuffer_DEFINED
9#define SkValidatingReadBuffer_DEFINED
10
11#include "SkRefCnt.h"
12#include "SkBitmapHeap.h"
13#include "SkReadBuffer.h"
14#include "SkWriteBuffer.h"
15#include "SkPath.h"
16#include "SkPicture.h"
17#include "SkReader32.h"
18
19class SkBitmap;
20
21class SkValidatingReadBuffer : public SkReadBuffer {
22public:
23    SkValidatingReadBuffer(const void* data, size_t size);
24    virtual ~SkValidatingReadBuffer();
25
26    virtual const void* skip(size_t size) SK_OVERRIDE;
27
28    // primitives
29    virtual bool readBool() SK_OVERRIDE;
30    virtual SkColor readColor() SK_OVERRIDE;
31    virtual SkFixed readFixed() SK_OVERRIDE;
32    virtual int32_t readInt() SK_OVERRIDE;
33    virtual SkScalar readScalar() SK_OVERRIDE;
34    virtual uint32_t readUInt() SK_OVERRIDE;
35    virtual int32_t read32() SK_OVERRIDE;
36
37    // strings -- the caller is responsible for freeing the string contents
38    virtual void readString(SkString* string) SK_OVERRIDE;
39    virtual void* readEncodedString(size_t* length, SkPaint::TextEncoding encoding) SK_OVERRIDE;
40
41    // common data structures
42    virtual SkFlattenable* readFlattenable(SkFlattenable::Type type) SK_OVERRIDE;
43    virtual void skipFlattenable() SK_OVERRIDE;
44    virtual void readPoint(SkPoint* point) SK_OVERRIDE;
45    virtual void readMatrix(SkMatrix* matrix) SK_OVERRIDE;
46    virtual void readIRect(SkIRect* rect) SK_OVERRIDE;
47    virtual void readRect(SkRect* rect) SK_OVERRIDE;
48    virtual void readRegion(SkRegion* region) SK_OVERRIDE;
49    virtual void readPath(SkPath* path) SK_OVERRIDE;
50
51    // binary data and arrays
52    virtual bool readByteArray(void* value, size_t size) SK_OVERRIDE;
53    virtual bool readColorArray(SkColor* colors, size_t size) SK_OVERRIDE;
54    virtual bool readIntArray(int32_t* values, size_t size) SK_OVERRIDE;
55    virtual bool readPointArray(SkPoint* points, size_t size) SK_OVERRIDE;
56    virtual bool readScalarArray(SkScalar* values, size_t size) SK_OVERRIDE;
57
58    // helpers to get info about arrays and binary data
59    virtual uint32_t getArrayCount() SK_OVERRIDE;
60
61    // TODO: Implement this (securely) when needed
62    virtual SkTypeface* readTypeface() SK_OVERRIDE;
63
64    virtual bool validate(bool isValid) SK_OVERRIDE;
65    virtual bool isValid() const SK_OVERRIDE;
66
67    virtual bool validateAvailable(size_t size) SK_OVERRIDE;
68
69private:
70    bool readArray(void* value, size_t size, size_t elementSize);
71
72    void setMemory(const void* data, size_t size);
73
74    static bool IsPtrAlign4(const void* ptr) {
75        return SkIsAlign4((uintptr_t)ptr);
76    }
77
78    bool fError;
79
80    typedef SkReadBuffer INHERITED;
81};
82
83#endif // SkValidatingReadBuffer_DEFINED
84